 | Thursday, September 23, 2004 |
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Thursday, September 23
Friday, September 24 |
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Thursday, September 23 Minnesota Wild Rice with Chicken Tuna Melt on Nine Grain $4.75 Breaded Veal with Mushroom Cream Sauce $3.75 Sweet & Sour Pork over Rice $3.75 BLT Ranch Wrap $4.75 Cheesey Breadsticks $2.25 Toasted Pecan Chicken Salad $4.75 Wilson Hall Cafe Menu Chez Leon |
 Mostly Sunny 84º/61º
Extended Forecast |
Secon Level 3 |
| Fermilab Today is online at: http://www.fnal.gov/today/ Send comments and suggestions to today@fnal.gov Fermilab Today archive Fermilab Today PDF Version Fermilab Result of the Week archive Fermilab Safety Tip of the Week archive Linear Collider News archive Fermilab Today classifieds Subscribe/Unsubscribe to |
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Maximizing Production
In Antiproton Source | ||
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Antiprotons drive the discovery process at Fermilab's Tevatron collider.
But they're hard to make: for every million hits of protons on a metal target,
only about 18-20 antiprotons ("Pbars") result.
Shutdown efforts in the Antiproton Source are focused on three key areas, aimed at maximizing Pbar flow into and around the Debuncher ring: the Injection Region, where Pbars are brought to the Debuncher; the installation of motorized quadrupole stands to improve orbit control and aperture in the Debuncher; and alignment at the target area. "Historically, the Injection Region is a known restriction," said David Vander
Replacing magnets and beam tube, along with installing a motorized kicker stand, will increase aperture and allow more Pbars to enter the Debuncher. The changes will also provide more margin for tuning and decrease the area's sensitivity to beam drift. Where entering and circulating Pbars formerly used two beampipes, the barrier between them has been removed to create a common vacuum. "We're probably 30 to 35 percent completed in the Injection Region," Vander Meulen said. "We've disassembled the old injection region, and we're starting assembly of the new components."
Also underway is the installation of motorized stands under 20 of the 114
Debuncher quadrupoles, allowing fine-tuning adjustments in the beampipe to
keep the beam in the center and maximize the available circulating space.
Ten magnets received such stands last year. The target area is also being
surveyed to determine whether the incoming and outgoing beamlines are in precise
head-on alignment; if they form an incorrect angle, precious antiprotons are
lost coming off the target. A Pbar saved is a Pbar earned.
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Fermilab Arts Series Presents Dr. Ralph Stanley & The Clinch Mountain Boys | ||
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The Fermilab Arts Series will present Dr. Ralph Stanley & The Clinch Mountain Boys
on Friday, September 25 at 8:00 p.m. in Ramsey Auditorium. Tickets are still available
for this performance.
Born in 1927, Stanley has been playing professionally since he and his oldest
brother,
Carter, formed a band in their native southwestern Virginia in 1946. Between
that date and 1966, when Carter died, the Stanley Brothers and the Clinch
Mountain Boys became two of the most celebrated bluegrass groups in the world.
After Carter’s death, Stanley shifted the band’s musical emphasis from bluegrass
to an older, sadder, less adorned mountain style. As a bandleader he nourished
such young and promising talents as Ricky Skaggs, Keith Whitley, Larry Sparks,
and Charlie Sizemore. Stanley has recorded nearly 200 albums along with the
Stanley Brothers, the Clinch Mountain Boys, as a solo artist, and to a broad
new audience of more than 5 million on the soundtrack to O Brother, Where Art
Thou?
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During the shutdown, Fermilab Today will offer a series on the history and
operation of the laboratory's accelerator complex. The transport lines is
the third in the series. The 750 keV transport line is the first of several transport or transfer lines that connect the five Fermi accelerators to each other in this order: Preaccelerator (Preacc) - 750 keV transport line - Linac - 400 MeV transport line - Booster - 8 GeV Injection line - Main Injector (MI) - A150 line for protons and the P150 line for antiprotons - Tevatron (TeV). Read the Current Accelerator Update |
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FYI: AIP Bulletin of Science Policy News, September 22, 2004 Senate Funding Recommendations for Math and Science Partnerships Senate appropriators have now passed FY 2005 appropriations bills funding the Math and Science Partnership (MSP) programs in both the Education Department and NSF. Under these bills, the Partnership program at the Department of Education would receive a 34.3 percent increase over FY 2004 funding, while the NSF Partnership program would be cut by 21.0 percent. Read more |
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Testing the Standard Model with Z's and Photons | ||
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The electroweak force has been tested to an unprecedented
precision at recent e+e- collider experiments at LEP and
SLC. At the Tevatron, the Z bosons and virtual photons are
produced in quark anti-quark collisions, where they can
decay to an electron-positron pair. The Tevatron can produce
electron-positron pairs at higher invariant masses (Mee)
than those accessible by the e+e- colliders, and probe
theories that predict new particles with high Mee.
Interference effects predicted by the Standard Model should lead to an asymmetry in the angular distribution of the electrons relative to the incoming quarks. Depending on Mee, the electron is more or less likely to travel in the direction of the quark. If an electron is found traveling within 90 of the direction of the incoming quark the event is called forward, otherwise it is called backward. A group from CDF has recently measured the asymmetry between the number of forward and backward events (Afb) as a function of Mee. The Afb dependence at high Mee is particularly interesting because the Standard Model predicts that it should have a constant value of about 0.6. An undiscovered particle could interfere with the Z and gamma production and modify Afb. Any change from the constant value predicted by the Standard model would be very noticeable. With a dataset of 72 pb-1, the results from CDF show good agreement with the Standard Model. The Mee dependence of the Afb measurement is also used to extract the Z-quark couplings and the Z-electron couplings for the first time at a hadron collider. | ||
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Result of the Week Archive
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Sing Happy Birthday to CERN this Friday Next month CERN will celebrate its 50th birthday. Fermilab and other particle physics labs are preparing a video birthday card that will be sent to CERN. Join us this Friday, September 24 at 11:30 a.m. on the front steps of Wilson Hall to sing Happy Birthday to CERN. For more information, contact Elizabeth Clements.
Hatha Yoga Classes at the High Rise
Wilson Hall Warden Training
Fermilab Film Series Friday
Voter Registration in Wilson Hall
Upcoming Power Outages
September 25 |
